Making CSWinRt into prop file for c# (#34225)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

more breaking out stuff

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## PR Checklist

- [ ] **Closes:** #xxx
- [ ] **Communication:** I've discussed this with core contributors
already. If work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end user facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

src/modules/colorPicker/ColorPickerUI/ColorPickerUI.csproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
-    <!-- Look at Directory.Build.props in root for common stuff as well -->
-    <Import Project="..\..\..\Common.SelfContained.props" />
+  <!-- Look at Directory.Build.props in root for common stuff as well -->
+  <Import Project="..\..\..\Common.Dotnet.CsWinRT.props" />
+  <Import Project="..\..\..\Common.SelfContained.props" />
 
   <PropertyGroup>
     <AssemblyTitle>PowerToys.ColorPickerUI</AssemblyTitle>
@@ -11,30 +12,13 @@
     <GenerateSatelliteAssembliesForCore>true</GenerateSatelliteAssembliesForCore>
     <UseWPF>true</UseWPF>
     <StartupObject>ColorPicker.Program</StartupObject>
-  </PropertyGroup>
-
-  <PropertyGroup>
     <ProjectGuid>{BA58206B-1493-4C75-BFEA-A85768A1E156}</ProjectGuid>
     <OutputType>WinExe</OutputType>
     <RootNamespace>ColorPicker</RootNamespace>
     <AssemblyName>PowerToys.ColorPickerUI</AssemblyName>
-    <TargetFramework>net8.0-windows10.0.20348.0</TargetFramework>
-    <TargetPlatformMinVersion>10.0.19041.0</TargetPlatformMinVersion>
-    <SupportedOSPlatformVersion>10.0.19041.0</SupportedOSPlatformVersion>
     <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
-    <DebugSymbols>true</DebugSymbols>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
-    <DebugType>full</DebugType>
-    <Optimize>false</Optimize>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)' == 'Release'">
-    <DefineConstants>TRACE</DefineConstants>
-    <DebugType>pdbonly</DebugType>
-    <ErrorReport>prompt</ErrorReport>
-    <Optimize>true</Optimize>
-  </PropertyGroup>
+
   <PropertyGroup>
     <ApplicationIcon>Assets\ColorPicker\icon.ico</ApplicationIcon>
     <NeutralLanguage>en-US</NeutralLanguage>
@@ -50,7 +34,6 @@
     <Resource Include="Shaders\GridShader.cso" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Windows.CsWinRT" />
     <PackageReference Include="System.ComponentModel.Composition" />
     <PackageReference Include="System.IO.Abstractions" />
     <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" />

src/modules/colorPicker/UnitTest-ColorPickerUI/UnitTest-ColorPickerUI.csproj

@@ -1,16 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
-  
+  <!-- Look at Directory.Build.props in root for common stuff as well -->
+  <Import Project="..\..\..\Common.Dotnet.CsWinRT.props" />
 
   <PropertyGroup>
-    <TargetFramework>net8.0-windows10.0.20348.0</TargetFramework>
-    <TargetPlatformMinVersion>10.0.19041.0</TargetPlatformMinVersion>
-    <SupportedOSPlatformVersion>10.0.19041.0</SupportedOSPlatformVersion>
     <ProjectGuid>{090CD7B7-3B0C-4D1D-BC98-83EB5D799BC1}</ProjectGuid>
     <RootNamespace>Microsoft.ColorPicker.UnitTests</RootNamespace>
     <IsPackable>false</IsPackable>
     <Nullable>enable</Nullable>
     <OutputType>Library</OutputType>
-    
   </PropertyGroup>
 
   <PropertyGroup>
@@ -18,7 +15,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Windows.CsWinRT" />
     <PackageReference Include="MSTest" />
     <PackageReference Include="Microsoft.Win32.SystemEvents">
       <!-- This package is a dependency of System.Drawing.Common, but we need to set it here so we can exclude the assets, so it doesn't conflict with the 8.0.1 dll coming from .NET SDK. -->